Having PHP installed, But get undefined functions error!!

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Hey guysI have just installed PHP with MySql with Apache server. I have installed PHPMyAdmin too. I could successfully enter to PHPmyAdmin and login and use it properly. But when I code a PHP source myself and call it from localhost, nothing displays. I have debugged the php file in Zend Studio. It gave me this error: [b]"Debug Error: ..\config.php line 11 - Call to undefined function mysql_connect()"[/b]To tell you that I am sure about the correctness of my codes, I have paste them here:[color=red][font=Verdana]$link = mysql_connect($db_host, $db_user, $db_pass);if (!$link) { die('Could not connect: ' . mysql_error()); }echo 'Connected successfully';[/font][/color]